Nancy Drew and the Diary of a Stranger

Talented inventor Joe Swenson disappeared when he went job hunting. Now his wife and daughter spend each day hoping he will return or get in touch. But time goes on, and there are no news: dead? Abducted? At the same time, detective Nancy Drew witnesses a fire and finds a diary that may have been left by the suspected arsonist. Are all these events connected, or will each case have to be unraveled separately? For middle school age.