Hot Topics in Crystal Engineering covers the design and synthesis of single crystalline solid-state materials, their properties and applications, focusing on the understanding and use of intermolecular interactions that constitute single crystalline materials. Many of the most modern materials, such as metal-organic frameworks (MOFs) capable of gas storage and separation, and selective entrapment of harmful substances, are the result of the rational use of crystal engineering. Topics covered in this work highlight breakthroughs in this rapidly developing field. This work offers a carefully chosen cross-section of the latest developments, some in their early infancy and some covered for the first time.