The fifth boxed set, Cherry Ames Boxed Set 17-20, contains Cherry's final adventures in four pulse-pounding mysteries: Companion Nurse, Jungle Nurse, The Mystery at the Doctor's Office, and Ski Nurse Mystery.

Cherry Ames, Companion Nurse
In Companion Nurse, Cherry's job as nurse to the well-known historical novelist Martha Logan would be an exciting assignment for any young and pretty RN. And it is doubly exciting for Cherry, for when the author goes to England to do research for her next book, Cherry goes along as companion nurse. But the glamour of new acquaintances and the thrill of seeing famous historic places is soon overshadowed by disturbing events. Martha Logan and Cherry visit the Selsam Gallery in London--it is robbed of a fortune in art treasures. Several days later they are enjoying the famous Carewe private collection--when four masterpieces are cut from their frames
Are the thefts somehow connected with their visits? Have some of their new acquaintances used Martha to help them perpetrate the thefts? Or is it merely coincidence that the places the two visit are robbed? Cherry thinks the evidence says NO.
It takes all the ingenuity and courage of the alert and pretty young nurse to fit the odd, baffling clues together and unmask the criminals in time to prevent another theft of priceless art.

Cherry Ames, Jungle Nurse
In Jungle Nurse, Cherry Ames is offered a temporary assignment to help establish a health clinic in a small native African village, she sees it as a once-in-a-lifetime opportunity. Not only will she be visiting a strange and exciting part of the world--but, more importantly, she will have a chance to help the underprivileged people of a very poor country. But no sooner has the clinic been built than Cherry finds herself caught up in the midst of a mysterious chain of events. Rough diamonds are being smuggled out of Africa--and Cherry's acute observations lead her to believe that the clinic itself is the base of the smugglers' operations
By carefully putting together obscure bits and pieces of evidence, and at great personal danger to herself, Cherry sets a trap for the criminals.
How the alert and pretty young nurse from the United States manages to put an end to an international smuggling ring provides a whirlwind finish to a fascinating story of mystery and intrigue.

Cherry Ames, The Mystery at the Doctor's Office
In The Mystery at the Doctor's Office, in a doctor's office nurse in New York City, Cherry Ames faces new challenges and makes some extraordinary new friends. First in importance is her dynamo of an employer, Dr. William Fairall. Glamorous theatrical patients flock to his Victorian brownstone offices. His assistant, young Dr. Grey Russell, plays a vital role in Cherry's eventful summer--and so do funny little elderly Dr. Lamb and the strangely moody medical secretary Irene Wick. Among the interesting, colorful people Cherry meets are a stricken ballet dancer, her handsome actor husband, and their adorable baby, who move into the vacant top floor of the brownstone.
And when her nurse friends, with whom she shares an apartment in Greenwich Village, inherit an old house near a beach in a charming summer resort area of eastern Long Island, Cherry foresees especially gay, carefree weekends.
But Cherry's expectations are soon shattered. Confronted by a mysterious, alarming series of events, the pretty nurse finds that she needs all of her detective skills when the clue of the dinosaur plunges her into the center of intrigue.

Cherry Ames, Ski Nurse Mystery
In Ski Nurse Mystery, Cherry Ames is thrilled to be working in a picturesque ski resort town in the Swiss Alps. The town's only doctor has employed her to assist him in his ten-bed hospital. Within 24 hours after starting her new assignment, Cherry encounters a hostile, menacing patient who seeks emergency medical care at the hospital. A few days later, other suspicious persons turn up at the hotel where she is living, and Cherry finds herself deeply enmeshed in an unknown danger.
Val Nicholas, a handsome ski instructor, helps Cherry to track down the source of the mysterious danger. Together, Val and Cherry undertake a perilous journey on skies, to protect her own life and to save the life of a sick man who is being victimized. It takes all of the vivacious and pretty young nurse's courage and stamina to expose an ingenious racket and trap a group of ruthless criminals.

Click here to read about Cherry Ames in The New York Times